کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5191651 1381236 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Morphology of an asymmetric ethyleneoxide-butadiene di-block copolymer in bulk and thin films
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Morphology of an asymmetric ethyleneoxide-butadiene di-block copolymer in bulk and thin films
چکیده انگلیسی
We present experiments on the melt and crystal morphology of a asymmetric semi-crystalline poly(ethylene/butylene-b-ethyleneoxide) diblock copolymer (PBh-b-PEO) in bulk as well as in thin films. Simultaneous small- and wide-angle X-ray scattering combined with AFM and TEM images reveal in the melt a bulk morphology of hexagonally packed cylinders of PEO in a PBh matrix, that transforms into a hexagonal perforated lamellar phase upon crystallization. X-ray reflectivity of thin films of PBh-b-PEO in the melt indicates wetting layers at the top and bottom interfaces, which force the cylinders in the interior to orient parallel to the substrate. Crystallization of the PEO block leads to roughening of the air/film interface and causes lateral structuring coexisting with planar lamellar layers in thinner films.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4868-4875
نویسندگان
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